Ace Your Next JavaScript Interview: `this`, `new`, Prototypes, Classes

JavaScript's `this` keyword, `new` operator, prototypes, and classes are explored in-depth. `this` is determined by how a function is called, not where it's defined. The `new` keyword creates objects and binds `this` to them. Prototypes form inheritance chains, while classes provide a syntax sugar over prototypes. The article recommends using composition over complex inheritance hierarchies for creating objects. It also notes that defining functions on prototypes can improve performance in certain scenarios.